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Electrochemical sensors based on TiO2–Fe2O3 coupled system

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Kusior A. , Karoń I. , Radecka M.

Metrology and Measurement Systems

2020

tom Vol. 27, nr 2

301--311

Recently, transition metal oxides, which exhibit favorable catalytic abilities, have also been investigated as a material for the detection of hydrazine (N2H4). It has been reported that mixed metal oxides usually offer a higher electrochemical activity than binary oxides. In this work, a TiO2-Fe2O3 coupled system is presented as an enhanced material with major applications in electrochemical detectors. The electrochemical behavior of glassy carbon electrodes modified with TiO2-Fe2O3 in the absence and presence of hydrazine was evaluated via cyclic voltammetry (CV). Experimental results also suggest that the formation of the TiO2-Fe2O3 coupled system enhances electrochemical catalytic performance in N2H4 detection. The modificationTiO2+2 mol% Fe2O3 provides good analytical performance of detection (0.13 mM) and quantification limits (0.39 mM). The presented coupled system provides the premise for a suitable material for a stable and sensitive N2H4 sensor.